Finding the Third Proportional to 78,216 and 103,716

Step by Step Solution

1. Step 1: Write the proportion equation
   78,216 : 103,716 = 103,716 : x
2. Step 2: Convert to fraction form
   78,216/103,716 = 103,716/x
3. Step 3: Cross multiply
   78,216x = 103,716 × 103,716
4. Step 4: Simplify right side
   78,216x = 10,757,008,656
5. Step 5: Solve for x
   x = 10,757,008,656/78,216
6. Step 6: Final answer
   x = 137,529.52